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Old 12-26-2007, 07:46 PM
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65 Chevy Fleetside P/Up rearend is old..

I have a 65 Chevy Fleetside P/Up. I have removed the older 6cyl that was in it, and dropped in a 283. I replaced the TH 350 with a newer 700R-4 trasns.
I got all the TV cable stuff.......drive shaft is shortened......even got the little valve thinngy that makes it so it won't shift out of OD at cruising speed unless you push 3/4 pedal.
I am not concerned with nose bleeding speed......or smoke shows....but I am a Pin Striper/Airbrush/ Fancy Paint kinda guy and I wanna drive this thing to a lot of Rod Runz and shows.....and I need good mileage more than anything.
Soooooooooo....Waddiyathink........is gonna be the best rear end ratio to run?
The original rear end is in it. I have NOT opened it up to count and figure what is in there.
It may turn out that I eventually go for disc brakes all the way around. Does anyone have any good ideas for what to look for as a transplant?
It has coils all the way around........and is dropped a few inches nut not notched.
This is NOT a show truck. It's my Shop truck and daily driver.

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Old 12-26-2007, 08:25 PM
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65 chevy

You do not have to take it apart to see gear ratio. Jack it up and put on jack stands. Put it in neutral. Get a friend you trust and turn each wheel so valve stem is down. Then mark pinion yoke and housing where you can see it while turning the wheels. You each take a tire and turn in the same direction as if you had posi exactly 1 revolution and Count how many times the yoke mark passes the housing mark and thats your ratio.Example, 3 and 3/4 turns = 3.73 gears. We built a Bad big block 65 out of an original 6 cyl 3 on the tree and used the stock rear end. We narrowed it 5" on each side and added posi.

Last edited by speedydeedy; 12-26-2007 at 08:30 PM. Reason: Wrong info
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Old 12-27-2007, 12:07 AM
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65 Rear end

Almost all the 65 C-10's had 4.10 rear gears,mine had a 6cyl 3spd originally too,when I got it it had a '78 Camaro 250 6cyl & 350 trans,I swapped out the 6 for a built 350 at 70mph it was cranking 3500 rpm I changed to a 700R4 and cruised at 2600 rpm. That was a big improvement! But if you run shorter profile tires a 3.55 ratio would be better.
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